How the compatible Inner Range SIFER 56-bit (I941747A) works
The Inner Range SIFER 56-bit (I941747A) is a dual-frequency credential operating on both 125 kHz LF and 13.56 MHz HF, so the compatible part must carry the correct data on whichever band your readers use. Its data structure is 56-bit: 24-bit site + 32-bit card, no parity (Inner Range SIFER ordering code I941747A). When you present a credential, the reader decodes that exact structure and passes it to your access-control panel as a card number it recognises.
We build the compatible Inner Range SIFER 56-bit (I941747A) by encoding the identical data structure onto a programmable T5577 / EM4305 chip. Once written, the reader cannot tell the difference between our credential and the original — it presents the same bits, the same facility code, and the same card number. That is what "compatible by specification" means: not a generic look-alike, but a credential engineered to read exactly as the original does, matched to your facility code and card-number range.
The Inner Range format sits among the specialist proximity credentials most card vendors never tooled up to produce — which is why the only other source is usually the original manufacturer, at a steep premium. Supporting these hard-to-find formats is exactly what Security ID Systems specialises in. Tell us the format printed on your card, or send a sample for us to read, and we confirm compatibility before you order.
Also known as
IR56 · Inner Range 56-bit · SIFER 56-bit · I941747A · SIFER-P · SIFER-U · SIFER-C
Inner Range and all other brand and product names are trademarks of their respective owners. Security ID Systems is an independent manufacturer and supplier of compatible access-control credentials and is not affiliated with, authorized by, sponsored by, or endorsed by these companies. Brand and format names are used only to identify the systems our products are compatible with. MIFARE and DESFire are registered trademarks of NXP B.V.